Changeable exhibitor



W. Z. MUSGRAVE.

CHANGEABLE EXHIBITOR. APPLICATION FILED. nov'. 28, l9|6.

' PatentedApr. 12,1921.

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' ATTORNEY w. z. MUSGRAVE.

CHANGEABLE EXHIBITOR. APPLICATION flLED NOV; 28, 1916.

- 1,37%?56. PatentedApn12,1921.

5 3 SHEETS-SHEET 2.

INVENTOR 7" f 'fflzm 6 W, Z I p I ATTORNEY w. z. MUS GRAVE. .CHANGEABLE EXHLB ITOR APPLICATION FILED NOV. 28 1916.

11,374,756, Patented Apr. 12, 1921.

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ATTO R N EY PATENT OFFICE.

WILLIAM z. MUSGRAVE, OFVATLANTA, GEORGIA.

CHANGEABLE EXHIBITOR.

Specification of Letters Patent. Patented A 12 Application filed November 28, 1916. Serial No. 133,949.

To all whom it may concern:

Be itknown that I, WILLI AM Z. MUS- GRAVE, a citizen of the United States, residingat Atlanta, in the county of Fulton and State of Georgia, have invented new and useful Improvements in Changeable Exhibitors, of which the following is a specification.

This invention relates to improvements in changeable exhibitors, and has particular application to a station indicator for use on street cars, inter-urban cars, etc., the present invention being in the nature of an 1mprovement upon the device described in, my prior Patent #1201858, dated October 17 1916.

In my prior patent, I employ a casing having a sight opening therein and carrying drums or rollers rotatably mounted above and below the sight opening, respectively, and a tape having the names of the stations inscribed thereon and having the ends thereof secured to the rollers and wrapped thereabout, so thatthe tape may be fed from one roller or drum to the other. In this movement of the tape, the names of-the streets or stations are brought into the sight opening successively. This tape passes over feed rollers and the shaft of one of the said rollers is equipped with a disk having a notch in the periphery thereof that is normally engaged by a lug on one end of alever that is under the control of an electro-responsive device, and when this device is energized the lever is actuated to disengage the lug from the notch in the periphery of the disk so as to release the feed roller.

As the electro-responsive device is energized momentarily, there is danger of the lug reentering the notch before the feed roller is 'sufiiciently revolved, therefore, in carrying out the present invention, it is my purpose to provide positive means for holding the lever in operative position succeeding the deenergization of the electro-responsive device, so as to prevent the lug on the lever from reentering the notch in the disk previously to the feed roller having revolved a sufficient distance to move the notch out of the range of the lug. I

It is also my purpose to provide positive brake mechanism for holding the rollers on the drums against rotation, and friction brake mechanism cooperating with the positive mechanism and acting previously to the positive mechanism to check the rotaplate 3 of tion of the drums, thereby eliminating undue strain on the parts when the positive mechanism is brought into service.

Another object of the invention is the prov sion of positive and friction brake mechanism for the drums or rollers, which will be under the control of thelug carrying lever and which will operate efliciently and effectively in the proper sequence.

lVith the above and other objects in View, the invention consists in the construction, combination, and arrangement of parts herein set forth and falling within the scope of the 'appendedclaims,

In the accompanying drawings Figure 1 is a diagrammatic view showing the circuit connections for my improved changeable exhibitor when the same is employed on an electrically operated car.

Fig. 2 is a front elevation of the exhibitor.

Fig. 3 is a vertical sectional view therethrough, parts being shown in end elevation.

Fig. 4 is a similar view, taken through the center of the casing.

Fig. 5 is a sectional view on the line 5-5 of Fig. 3. I

Fig. 6 is a horizontal sectional view through the exhibitor brake mechanism.

Fig. 7 is avertical sectional view taken through the other end of the casing, parts being shown in end elevation. Fig. 8 is'a view in end elevation of a detailof the invention. 7 7

Fig. 9 is a sectional view through the same.

Fig. 10 is a perspective view ofthe looking disk. I v y I Referring now to the drawings in detail, 1 designates acasing constructed of suitable material and having the front wall formed with-a sight opening 2 that is closed by a material.

Arranged within the casing 1 adjacent glass or other transparen to the respective end walls thereof are vertical frames 4, and journaled in the frames 4 are the ends of horizontal shafts 5 and 6 ar-' ranged above andbelow the sight opening 2, respectively. Fixed upon each shaft 5, 6

is aroller or drum '7. Rotatably mounted in the frame 1 in advance of the drums 7 are feed rollers 8 arranged above and below the sight opening 2. The [upper feed rolleris disposed in a plane below the upper drum 7, while the lower feed roller is arranged in a plane above the bottom drum. Connected sri-al with the frames 4 are spring held arms 9, and j ournaled in the outer ends of the arms 9 are feed rollers 10 that bear against the feed rollers 8, respectively, as clearly shown in Figs. 3 and 4 of the drawings. 11 designates a tape or web upon which the names of the streets or stations are inscribed, and this web is trained between the feed rollers 8 and 10 and the ends thereof are secured to the drums 7 and wrapped about the same so that when one drum is revolved to wind up the tape and the other drum rotated to unwind the tape, the names of the streets or stations will be brought into the sight opening successively.

Fixed upon one end of each shaft 5, 6 is a spur pinion 12 and pivoted between its ends on the frame 4 is a lever 13 having one end projecting outwardly through a slot 14 formed in the front wall of the casing 1' and the other end widened, as at 15. This lever 13 is arranged between the shafts 5 and 6 and rotatably mounted upon an axle 16. Carried by the lever 13 between the fulcrum thereof and the widened end 15 is a spur gear 17 adapted to be moved into engagement with one or the other of the pinions 12. Journaled in the widened end15 of the lever 13 is a pinion 18 that meshes with the gear 17, and meshing with the pinion 18 is a pinion 19 journaled in. the widened end of the lever. These pinions 18 and 19 are disposed upon one side of the longitudinal center line of the lever, and j ournaled in the widened end of the lever at the other side of the longitudinal center line is a spur pinion 20 that meshes with the gear 17. 21 designates the driving motor, which in the present instance is of the spring actuated type, and fixed upon the shaft of the motor 21 is a spur gear 22 meshing with a pinion 23 fixed upon one end of a shaft 24. The other end of the shaft 24 is arranged between the pinions 19 and 20, as clearly illustrated in Fig. 7 of the drawings, and fixed upon such end of the shaft is a pinion 25 adapted to mesh with either of the pin ions 19 or 20 according to the position of the lever 13. i

The lever 13 and the gears 17, 18-, 19and 20 carried thereby, the shaft 24 and the motor 21, constitute the driving mechanism for the drums 7, and, when it is desired to drive the drums in one direction the lever 13 is swung about its fulcrum to engage the gear 17 with the pinion 12 on the shaft 5 and engage the pinion 20 with the pinion 25 on the shaft 24. Thus, in the operation of the motor, the tape will be wound on the drum 7 on the shaft 5 and unwound from the drum 7. on the shaft 6. On the other hand, when it is desiredto reversethe directionof movement of the tape, the lever 13 is swung about its fulcrum to engage the gear 17 with the pinion 12011 the shaft 6 and engage the pinion 19 with the pinion 25 so that in the operation of the motor, the drum 7 on the shaft 6 will be rotated to wind up the tape and the drum 7 on the shaft 5 permitted to idle to facilitate the unwinding of the tape therefrom.

In this embodiment of my invention, the

niechainsm for controlling the movement of the drums under the action of the motor embodies a disk 26 fixed upon the shaft of the upper feed roller 8, and formed with a peripheral notch 27 and with a cam shoe 28 on the outer side thereof adjacent to the periphery, the center of the shoe alining with the notch 27. Secured to the frame 4 adjacent to the disk 26 is a supporting arm 29 arranged below the magnet and upstanding from the supportingarm 29 is a post 30. Pivoted upon the postSO is alever 31 having one end arranged below the disk 26 and the other end projecting beyond the post. Mounted upon the arm 29 adjacent to the post 30 is an electromagnet 32 and secured to the lower edge of the lever 31 above the magnet 32 is an armature 33 disposed within the influence of the pole of the magnet. The end of the lever 31 below the disk 26 is formed with a depending bar 34 formed with a vertical bore 35 that opens onto the upper edge of thelever 31. The lower end of the bore 35 is closed by a plug 36, and slidably mounted in the upper end of the bore is a bolt 37 equipped with a cross pin 38 having the ends thereof working in slots 39 formed in opposite walls of the bore. The upper part of the bolt 37 is adapted to. engage in the notch 27 in order to hold the'disk and the feed rollers against rotation, while the lower end of the bolt is provided with a stem 40 that slides through a bore in'the plug 36. Encircling the stem 40 is a coiled expansion spring 41 having one end in engagement with the plug and the other end abutting the bolt, the spring acting to hold the bolt normally at its limit of upward movement. Connected to the bar 34 is a curved leaf spring 42, and, in the normal position of the disk 26 and the lever 31, the upper end of the leaf spring 42 engages the cam shoe 28 at the center of the latter. 'Thisleaf spring 42 and the cam shoe 28 constitute an important part of the present invention, and upon the energization of the magnet 32, the lever 31 is swung downwardly to disengage the bolt 3. from the notch 27. v

Through the downward movement of the lever 31., the upper end of the leaf spring 42 is caused to ride 01? the camshoe 28 and engages with the periphery of said cam in order to hold the lever 31 inoperative position as the magnet 32 is deenergized. This will prevent the bolt 37 from reentering the notch27 in the event of the magnet being momentarily energized; As soon as the disk 26 is relieved of the restraining influence of thebolt 37 acting in the notch 27, the spring motor will act to operate the exhibitor, as has been previously described.

As soon as the notch 27 is moved a suitcient distance away from the locking bolt 37, the spring 42 will be disengaged from the edge of the cam. The bolt 37 will then move in the bore 35, compressing the spring 41 as the bolt contacts and engages with the unnotched portion of the periphery of the disk 26. As soon as the notch27 coincides or is brought'into registering engagement with the upper end of the bolt 37, the latter will then be forced into the notch by the expanding action of the spring 41. This will serve to check or stop the rotation of the feed rollers. V

In the present instance, the positive brake mechanism for the drums embodies spur pinions 43 fixed to the ends of the shafts 5 and 6, respectively, opposite from the pinions 12, and a vertical bar 44 pivotally connected to the lever 31 and having the upper end formed with teeth to'engage the pinion 43 on the shaft 5 and the lower end inturned and formed with teeth that engage the pinion 43 on the shaft 6. This bar 44 is formed with a slot 45 through which the adjacent end of the shaft 6 projects, the shaft acting to hold the bar 44 against lateral movement. This bar 44 is normally in engagement with the pinions 43 to hold the drums stationary, and when the lever 31 is swung under the action of the magnet 32 the bar is lowered to release the drums. A spring 46 has one end connected to the arm 29 and the other end connected to the lever 31, and this spring acts to hold the lever 31 in normal position and return the same to such position upon the deenergization of the magnet-32. 4

Mounted upon the frame 4 opposite to I that carrying the arm 29 is an arm 47 arranged between the shafts 5 and 6 and connected with the outer end of the arm 47 by a pin and slot connection 48 is a lever 49. One end of the lever 49 normally engages a cam shoe 50 on the end of the feed roller 3 opposite from the disk 26. The lower endof the lever 49 is pivotally connected with one extremity of a horizontal lever 51 that :is fulcrumed between its endsupon a bracket carried by the adjacent frame 4, and the other end of the lever 51 frictionally engages a brake disk 52 mounted upon the shaft 24 and under the control. of ball governor mechanism 53, the governor mechanism being responsive to the action of centrifugal force in the rotation of the shaft 24 to draw the disk 52 into tight engagement with the lever 51. The lever 49 is normally held elevated by means of a spring 54 and connected to the lever 49 adjacent to the upper extremity thereof and projecting outwardly therefrom is apin '55. 56 designates a rock shaft having the endsjournaled in the respective frames 4 and fixed upon one end of the rock shaft is a right angulararm 57 that has one leg disposed below thelever 31 while connected to the other end of the rock shaft and projecting outwardly therefrom is an arm 58 adapted to engage the pin 55.

In the downward movement of the lever 31 the shaft 56 is rocked incident to the lever A engaging the arm 57 and in this movement 'The lever 31 is held depressed from the 7 time the bolt 37 leaves the notch 27 until it rcenters said notch or during the entire revolution of the disk 26. The length of the spring 42 projecting above the lever 31 is sufficient to hold the bolt from engagement with the periphery of the disk by riding under the cam 23 until the notch has been passed. hen the spring 42 rides oif the cam 28, the bolt 37 engages the periphery of the disk 26 and is partly depressedwithin the bore 35 through the influence of the spring 46, the lengthof the slots 39however, beingsuch as to prevent the bolt from entirely entering the bore, thereby holding the bar 44 from engage ment with the pinions 43 until the notch again reaches the bolt.

The downward movement of the lever 31 V rocks the shaft 56, through the engagement of said lever with the arm 57. This move- "disk 26, permitting the spring motor to rotate the drums. The lever 49 is held downlution of the disk 26, the pin 55 being sufficiently long to permit "of the sidewise movement of the said lever 49 without disengaging said pin from under said arm.

ward by the arm 58 during a complete revo- The lever 51 is therefore held from engagement with the disk 52, unless the speed of the mechanism is reat enough to cause the centrifugal governor to move the disk into engagement. Upon the bolt 37 entering the notch 27 in the disk 26, the arm 58 moves upward permitting the upward movement of the lever 49 and the engagement of the lever with the disk 52.

In the event of the too rapid rotation of the drums, the governor mechanism 53 will draw the brake disk 52 along the shaft 24: and into engagement with the lever 51, thereby checking the rotation of the drums.

As soon as the drums have made one complete revolution, the name of the next street or station is brought into the sight opening and the drums and feed rollers locked against further movement.

In the present instance, I have shown the electromagnet 82 as connected in a controlling circuit 59 including a battery 60 and a circuit closer 61. This circuit closer 61 is identical in construction to the circuit closer shown and described in my former patent, and is under the control of obstacles suspended from the guy wires of the trolley wire.

The motor 21 is equipped with a shaft 62 that extends through one end wall of the casing and is provided with a handle 63 whereby the spring of the motor may be placed under tension so that the motor ma operate at the proper time.

While I have herein shown and described the preferred form of my invention by way of illustration, I wish it to be understood that I do not limit or confine myself to the precise details of construction herein clescribed and delineated, as modification and variation may be made within the scope of the claims and without departing from the spirit of the invention.

I claim 1. In a changeable exhibitor, a casing having a sight opening therein, drums journaled in said casing above and below the sight opening respectively, a tape movable across the sight opening and having the ends thereof secured to said drums and wrapped about the same, a motor, driving connections between the said motor and drums whereby the tape may be moved across the sight opening, means holding said drums normally against rotation, and operable to release the drums so that the latter may be revolved under the action of said motor, brake mechanism and means connecting the drum holding means and brake mechanism for actuating the brake prior to the operation of the drum holding means.

2. In a changeable exhibitor, a casing having a sight opening therein, drums ournaled in said casing above and below the sight opening, respectively, a tape movable across the sight opening and having the ends thereof secured to said drums and wrapped about the same, a motor for rotating said drums, positive brake mechanism for checking the rotation of said drums, friction brake mechanism for checking the speed of said drums previous to the positive brake mechanism acting upon said drums, and means holding said drums normally against rotation and operable to release the drums and controlling said positive brake mechanism and said friction mechanism.

3. In a changeable exhibitor, a casing having a sight opening therein, drums ournaled in. said casing above and below the said sight opening, a tape movable across said sight opening and having the ends thereof secured to said drums respectively and wound about the same, a motor, driving connections between said motor and drums, electroresponsive controlled means holding said drums normally against rotation under the action of said motor, and friction brake mechanism including a drum controlled hand operated lever cooperating with said positive brake mechanism and said means and under the control of said means and adapted to act previous to said positive brake mechanism.

In testimony whereof I afiix my signature.

WILLIAM Z. MUSGRAVE. 

